Controller for machine tools



FIG. 1 is a bottom, front and side perspective view of a controller for machine tools showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for a controller for machine tools, as shown and described. 